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Heart rate as a measure of stress in Antarctic krill, Euphausia superba

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Ritz, DA and Cromer, L and Swadling, KM and Nicol, S and Osborn, J (2003) Heart rate as a measure of stress in Antarctic krill, Euphausia superba. Journal of the Marine Biological Association of the United Kingdom, 83. pp. 329-330. ISSN 0025-3154

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Abstract

Antarctic krill, Euphausia superba, normally live in social aggregations (schools) but rarely aggregate in laboratory tanks. In order to study the effect of stress on solitary living we tethered krill to wooden skewers and measured heart rate both when they were held isolated from conspecifics and when they were held at normal schooling distances ([similar]1 body length). Heart rate did not differ significantly with sex or body size. However, intermoult krill had a significantly lower heart rate than postmoult animals. When two individuals were held at schooling distance, with one slightly higher in the water column than the other, the heart rate of the higher individual slowed significantly (106–98 beats min−1), while that of the lower individual remained the same. We interpret these results to mean that krill living solitarily are stressed but will respond to neighbouring individuals by decreasing their metabolic rate and saving energy.

Item Type: Article
Journal or Publication Title: Journal of the Marine Biological Association of the United Kingdom
Page Range: pp. 329-330
ISSN: 0025-3154
Identification Number - DOI: 10.1017/S002531540300715Xh
Additional Information: © 2003 Cambridge University Press
Date Deposited: 18 Feb 2009 22:12
Last Modified: 18 Nov 2014 03:55
URI: http://eprints.utas.edu.au/id/eprint/8357
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